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Measurement of the branching fraction of B^+ to τ^+ ν_τ decays with the semileptonic tagging method and the full Belle data sample
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arxiv 1409.5269 v1 pith:R6HCRO4L submitted 2014-09-18 hep-ex
Measurement of the branching fraction of B^+ to τ^+ ν_τ decays with the semileptonic tagging method and the full Belle data sample
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We report a measurement of the branching fraction of $B^+ \to \tau^+ \nu_\tau$ decays using a data sample of $772 \times 10^6 B \bar{B}$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We reconstruct the accompanying $B$ meson in a semileptonic decay and detect the $B^+ \to \tau^+ \nu_\tau$ candidate in the recoiling event. We obtain a branching fraction of ${\cal B}(B^+ \to \tau^+ \nu_\tau) = [1.25 \pm 0.28 ({\rm stat.}) \pm 0.27({\rm syst.})] \times 10^{-4}$. This result is in good agreement with previous measurements and the expectation from calculations based on the Standard Model.
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